ok, i just installed a Mac off road Y pipe with a pair of O2 simms and now i'm getting up to 3 degrees of KR. prior to the ORY, i never got any knock. at first i thought it was because my Y pipe was banging my driveshaft loop, but i fixed that tonight and i still have knock...

any ideas? did this lean my car out? i have a Predator programmer so i can play around with it some. i may try putting some 95 octane in to see if it goes away... any other suggestions i should try? i always have a hard time reading my 02's on the predator while driving--they jump around so much anyway.